I read http://blog.xebia.com/2011/06/getting-started-with-node-js-npm-coffeescript-express-jade-and-redis/ and loved it!
My first thought was "Heroku support all these technologies right? Let's get it running on there!" --- and it worked!
To get this working on Heroku I needed to include some ideas from here to get Redis working.
The end result is here, and the source is on Github.
If I get enough comments I'll write a step by step how-to, but basically ...
* Download my code.
* Use the ruby heroku gem to create a heroku app and turn on redis
* Use git to deploy..
That's all you need.
Update: Sorry the app is down at the moment. It has been ages since I last looked at it, and Heroku have upgraded the instances since then.